Exhibiting instrument



A ril 12, 1938. R. w. R055 ET AL EX'HIBITING' INSTRUMENT I Filerl'April 18, 1955 4 Sheets-Sheet 1 INVENTORS M3. 4 m ZS 5 3 rw wfmw ATTORNEY.

April 12, 1938. Rfw. ROSS ET AL 2,113,748 1 I 1111 113111111; INSTRUMENT Filed 1 m 1a, 1936 4 Sheets-Sheet 2 INVENTORS Md I ATTORNEY.

pfi 12, 38 R. w. R085 ET AL. 113,148

J EXHIBITING INSTRUMENT Filed April 18. 1936 4 Sheets-Sheet 3 April 12, 1938. R. w. R085 El Al.

EXHIBITING INSTRUMENT Filed April 18, 1936 4 Sheets-Sheet 4 UNITED STATES PATENT OFFICE I 6 Raymond W.

H. Seberhagen, by Sophie Scberha en, Pa., assignors to Leeds Ross, Philadelphia, 'um Sigurd deceased,

executrix, Philadelphia,

late of Philadelphia,

and Northrop Company, Philadelphia, Pa, a corporation of Pennsylvania Application April 18, 1936, Serial No. 75,209

8 Claims. '(01. 234-45) This invention relates to exhibiting instruments including apparatus for indicating and or recording, or otherwise measuring the magnitude of electrical,

physical, chemical or other conditions or controlling them in response to changes thereof, and more particularly to such apparatus made up of a plurality of readily interchangeable and complemental unit asemblies by means of which the apparatus may be adapted to various types of service.

This application is a continuation-in-part of our copending application Serial No. 3,274, filed January 24, 1935, for Recording apparatus.

More specifically, this invention comprises indicating, recording, and/or controlling apparatus having a main chassis or frame upon whichare mounted or supported to form a single unit the essential parts of the recorder, or those parts or mechanisms which are common to all types ofinstruments; these include the primary condition responsive element, such as a galvanometer, a power device, and a mechanical relay apparatus driven by the power device for reproducing deflections of the primary conditionresponsive element with-amplifieddisplacement and/or torque.

To the main chassis vidually secured one of a is detachably and indiplurality of interchangeable recording element units or assemblies effective to convert the recorder into any of a number of desired types, for example, a simple curve drawing instrument, a dot-and-dash instrument, or a multiple-record printing instrument; alsothere is detachably secured theretoone of a plurality of interchangeable unit operating mechanisms or assemblies for the several recording element assemblies;

assembly matic recalibrating further, an autowhich may be applied as'a unit, or omitted, in accordance with the requirements of a particular installation; and,

further, a unit record chart assembly interchangeable with other similar as well as different units for adapting the instrument to different scales or ranges of operation and for operation with strip charts or round charts.

While this invention is of general application and may include any of the well-known recording mechanisms, exhibiting apparatus, or operating mechanisms therefor, it is particularly suitable for application to a recorder embodying the several improved recording and operating mechanisms described and claimed imthe copending applications, Serial Nos. 714,546, filed March 8, .1934, 75,208, filed April-1936, and 3,194, 3,195

and 3,196, filed January 23, 1935, each application pended claims.

In the drawings, Fig. 1 is a perspective view of the main frame or chassis forming a part of the improved recording apparatus and upon which are permanently mounted the essential mechanisms of the recorder common to all its variations or types;

Figs. 1A, 1B, 1C are perspective views of subsidiary or complementary frames including necessary structure to form, respectively, in conjunction with the main chassis of Fig. 1, recording element assemblies for a curve drawing instrument, a dot-and-dash instrument, and a multiple-record printing instrument;'

Figs. 1D and 1E are perspective views of additional subsidiary frames complemental to the main chassis of Fig. 1 and including, respectively, record chart supporting and driving means for a, strip chart, and for a round chart;

Fig. 1F is a perspective view of an automatic current adjuster or recalibrating unit arranged to be mounted on the main chassis to form a complementary unit thereto;

Figs. 1G, 1H and 1K are respectively perspective views of panels supporting component parts further to vary the type or character of particular recording mechanisms, each panel having provisions for support. from the main chassis or frame;

Fig. 1b is a perspective view of a unit operating mechanism arranged for complemental mounting on the main chassis and provided with means forming a driving connection for the recording element assembly of Fig. 113;

Fig. 1c is a perspective view of a'unit operating mechanism arranged for complemental mounting on the main chassis andprovided with means forming a driving connection for the recording element assembly of Fig. 10;-

Fig. 2 is a schematic diagram measuring network or circuit;

Fig. 3 is a perspective view, in part diagrammatic, of essential, elements of the chassis of Fig. 1, the recalibrating unit of Fig. IF, the operating mechanism of Fig. 1c and the multiple record printing mechanism of Fig. 10;

Fig. 3A is a detail view of an operating cam shown in Fig. 3;

of one form of I chassis of Fig. 6;

Fig. 4 is a schematic representation of essential elements of the operating mechanism of Fig. 1b

and of the'dot-and-dash recorder of Fig. 13;

Fig. 4A is a detail view, in part diagrammatic, illustrating a selector switch and associated op erating mechanism;

Fig. 5 is an end elevation of the print wheel, inking drum, their supports and connecting gearing of Fig. 1C; v

Fig. 6' is a perspective view of the main chassis of Fig. 1 as seen from the front of the instrument prior to mounting in the case;

Fig. 6A is a perspective view of an. enclosing housing or case;

Fig. 6B is a perspective view of an alternative form of housing with its rear door open, the front door omitted, and one wall broken away to show a part of a double-hinge arrangement and its associated interlocking means Fig. 6C is a perspective view of the strip-chart mechanism of Fig. ID as seen from the front of the instrument prior to, assembly on the main Fig. 6D is a perspective view of the round-chart drive of Fig. 1E as viewed from the front of the instrument and prior to assembly on the main chassis of Fig. 6; I

Fig. 6c is a perspective view of a front door for either of the housings to be used with the strip chart of Fig. 6C;

Fig. (id is a perspective view of a front door for the housings of Fig. 6A or Fig. 63 to be used when the round-chart drive of Fig. 6D is used instead of the strip-chart drive of Fig. 6C; and

Fig. SE is a fractional cross-sectional view; of the hinge pin 24 and its associated parts.

Referring now more particularly to Fig. 1 of the drawings, a main supporting frame or chassis l0 has provisions to receive complemental framesfor the formation of unitary structure comprising the essential operating mechanisms for a desired type of exhibiting instrument or recorder. Thus each one of the several different types of the recording element units and/or mechanisms illustrated on sheet 1 of the drawings is designed and arranged for direct mounting upon the main chassis l0 without interfering with each other, but for cooperation to perform their intended functions. 7

In case a simple curve drawing strip-chart instrument is desired, the unit recording element assembly of Fig. 1A is mounted directly upon the main chassis ID by means of projecting legs 12 and i 3 depending from unit frame, the lower ends thereof I2a and l3b being provided with openings registering with openings I 0a and "lb provided in bosses Illd and "la of the main chassis Ill. The unit frame I4 is rigidly secured in place by belts or by cap screws, the use of the latter of course requiring that the openings Illa and 10b be threaded to receive them. A marker or pen l5 and its carriage lia is slidably mounted upon an elongated element, as the supporting shaft l6 carried by the unit frame It, and may be of the type disclosed in the aforesaid copending application Serial No. 3,195.

Forcooperation with the pen IS, the record chart assembly of Fig. 1D is secured to the main chassis I 0. This assembly comprises a unit frame I8 carrying mandrels I9, 20 and 21 upon which the markable element, shown as a strip chart C, is wound.

By means of hinge elements 22 and 23 the frame l8 may be lowered over hinge pins 24 and 25 carried by the main chassis ID. Preferably the hinge pin 24, in the form of a sleeve fastened by a key 2470 to the main chassis III, is of the type described in the aforesaid copending application, Serial No. 714,756. Briefly, Fig. 6E, it consists of a worm 240 secured by pin 24c to a stub shaft 24b journaled within the sleeve 24 and driven by the skew gears 26a and 26b. As shown, the frame l8, while at a substantial angle to the, main-chassis, is lowered, its hinge elements 22 and 23 receiving the hinge pins 24 and 25, to a position such that the top of the chart C on mandrel I3 is substantially below the pen I 5. Suitable mechanism, such as a cam 2 5a arranged to engage the top of pin 25, itself rigidly secured to the main chassis l0 as by pin 25b, is provided so that after frame I8 has been swung about the hinge pins 24 and 25 in a clockwise direction as viewed from above the instrument, to bring the chart C into a position parallel to the pen-supporting rod iii of Fig. 1A, the chart may be elevated byrotation of arm 250 (Fig. 6c) and cam 25a to a position to be engaged by the marker or pen l5. In the fully assembled position, the worm 24a meshes with worm wheel 21 utilized to drive the strip chart, suitable driving means (not shown) the re-roll mandrel. The mandrel 20 supports the chart feed roll.

The pen l5 includes an ink. reservoir to insure an ample supply of ink or marking fluid by means of which it draws distinctive curves upon the chart.

An important feature of the present invention, besides the permanent location on the main chassis ID of a source of power, as a motor, for driving the strip chart as well as means for moving the marker across the chart in response to changes in the magnitude or character of the condition under measurement or control, is the fact the chassis and its actuating means or devices have provisions for supporting and operating separate unit assemblies which in selected complemental assembly provide any of a number of different types of instruments.

, The operating and condition responsive devices common to all forms of the recorder instruments are preferably of the type described in U. S. Letters Patent 1,935,732, granted November 21, 1933, upon the application of L. Y. Squibb. In brief, this mechanism comprises a sensitive mechanical relay apparatus having a pair of clamping members or bars 28 (Fig. 3) between which a pointer 29 of a sensitive device, as a galvanometer G, is periodically free to deflect. One of the bars 28, for example the lower bar, is periodically moved toward engagement with the other, and with the pointer 29 by means of linkage elements (not shown) and a cam 30a continuously rotated by a power shaft 30 driven by a power means or motor M through suitable gearing 30b. There are also provided a pair of scissors-like pointer-engaging arms or feelers 3| pivoted respectively and intermediate their ends on a plate 32, shown in dotted outline in Fig. 3, and biased by a spring 3la into engagement with each other.

in the above Squibb patent. It is suiiicient here 75 through secured, amounts likewise deflection of the pointer 29.

portion of the shaft 30 as viewed in Fig. 1,- as byto say the galvanometer is connected to be responsive to a condition under measurement; that is to say, the pointer 29 is periodically free to deflect in response to unbalance of a circuit caused by variations in magnitude of the condition to be measured or controlled. After a period of freedom, the clamping bars 28 engage and retain the pointer 29 in a fixed position; the

feelers 3!, previously separated by the cam 30a,

are then freed, the opposite ends moving toward each other. The pointer 29, acting as a stop for the upper end of one of them, permits the lower end of the other to engage a projection of the clutch arm 33 to move it about its pivot 33a an angle depending upon the extent of deflection of the pointer from its central or neutral position. The pointer 29 is thenreleased, the plate 32 pivoted at 32a, Fig. 3, moved to bring clutch arm 33 into engagement with the disk 34 and one of a pair of restoring cams 31 carried by the shaft 30 thereupon returns the clutch arm 33 to its horizontal and neutral position, rotating the clutch disk 34 and shaft 36, to which it is Also supported on and driven by the shaft 35 is a slidewire 39 which is preferably included in the galvanometer or condition responsive network for the purpose of rebalancing the measuring network or circuit to return the galvanometer pointer 29 to its normal position. If the circuit is not fully rebalanced, by a single adjustment, additional galvanometer deflections by the aforesaid cycle of operations adjusts the slidewire 39 until no deflection of the pointer 29 occurs, the network or circuit then being in balance. The shaft 36 also carries a pulley 40, shown in Figs. 1 and 6 but for clarity omitted in Fig. 3, which drives a cord or endless belt 4| passing over idler pulleys 42.

Provisions are made to secure the cord to the pen or marker-supporting carriage Ia. As shown (Figs. 1 and 1A), a plate 44 clamped to the belt 4| is provided with openings 440. through which extend pins 45 projecting from the marker carriage l5a to form a driving connection therebetween.

With the curve drawing instrument comprising the recording element assembly of Fig. 1A, the chart assembly of Fig. 1D, and the main chassis integrally secured together as aforesaid, it will be seen that the mechanical relay will displace the chart or the markable element C. From the position of the pen or marker l5 with respect to the chart, in conjunction with graduations on the chart which extend from edge to edge thereof, there may be read the magnitude of the condition under measurement or control. The marker or pen i5 places on the chart a record of the magnitude of the condition; as shown in Fig. 1, the chart driving gear 21 is driven through worm 24a, skew gears 26a and 26b, shaft 26 and gearing 25c.from the the marker across shaft 39 and motor M. The speed of the chart Y by the aforesaid gearing is preferably reduced. By graduating the chart in the direction of its movement the magnitude of the condition as re corded on the chart by the marker for any given time, as, minutes, hours, or days may be readily determined.

The galvanometer circuit or condition responsiv'e network may be of the potentiometer or of the Wheatstone bridge type. For a circuit of the Wheatstone bridge type, a panel 49, Fig. 1K, is

suitably secured in position behind the right-hand circuit may be of depending upon the screws extending through openings 43a to the main chassis Ill. The panel 48 carries a plurality of resistance elements 43 of suitable value to form thearms of the bridge, provisions being made for including in one bridge arm, a condition responsive device, as a resistor whose resistance varies with the condition under measurement or control.

When the recorder is used in a potentiometertype measuring circuit a sub-panel 50, Fig. 1G, carryingresistors iii, a calibrating switch 52, and a standard cell S, is secured to the main chassis It in place of the panel 43.

the form shown in Fig. 2 wherein a suitable source of supply, as battery 53, is connected in series circuit relation with a calibrating slidewire 54, resistances 5|, and the slidewire 39. The galvanometer G is connected in series with a thermocouple 56 whose voltage is normally balanced by adj tment of the slidewire 39. As will be explained more fully hereinafter, a selector switch 51 serves to connect in predetermined sequence additional responsive elements, only one, the element 56a, of which is The potentiometershown. The calibrating switch 52, when operated from its left hand position to its right hand position, as viewed in Fig. 2, serves to connect the standard cell S directly in series with the galvanometer G. The voltage of the cell S as applied to the circuit is independent of the setting of the slidewire 39; if the voltage'of the battery 53 has deviated from a predetermined value, the galvanometer deflects in direction and extent proportional to the deviation.

While the recalibration of the potentiometer circuit may sometimes be unnecessary, it is desirable periodically to determine the extent of change of the voltage of the battery 53 and automatically to adjust the calibrating resistance 54 in order to prevent errors in the galvanometer deflection, and to insure the deflection is dependent onlyupon variation in the condition under measurement or control. To this end a calibrating unit of the type shown and described in the aforesaid copending application Serial No. 75,208 is utilized and as embodied herein comprises a subsidiary frame 60,- Fig. 1F, which supports the calibrating resistance 54 shown in the form of a slidewire, an arm 6| arranged to opported on the'same shaft as will more clearly appear hereinafter. An opening 500 of the frame 60 is adapted to slide over a boss lflf projecting from the main chassis Ill, a set screw 60 being provided additionally a fixed position. Due to the disk 62 and slidewire 54 it is necessary to turn the frame 60 in a clockwise direction about the axis of the boss I0! until the disk is free of the main chassis. The frame 60 is then moved axially of the boss until the disk 62 registers with opening Inn and by rotating the frame 60 in a counter-clockwise direction the disk 62 is moved through Opening Ink and into alignment with a driving disk 63 omitted in Fig. l for the sake of clarity but shown in Fig. 3 The frame 80 is clamped into a fixed position by means of the set screw 60!.

With the recalibrating unitof Fig. 1F assembled on the main chassis ID, reference may be had to Fig. 3 in connection with the following description of its operation.v Assuming that recalibration to lock the frame into is desired every forty-eight minutes, a doublereduction' Worm gear drive is interposed between a disk 6! and the shaft which rotates at substantially constant speed; the gear drive has a ratio such that'the disk 54 completes one revoluti'on every forty-eight minutes, The reduction gear drive comprises a. worm 86 secured to shaft 30 and meshing with-a worm wheel fi'l upon whose shaft 68 a worm $9-meshes with a worm wheel Hi arranged to drivethe'disk 64. By means of a notch 64a in the periphery of the disk 64, an arm 'il, pivoted at 12, 15 released forclockwi se movement under the influence of a biasing spring 13, the outer or free end of arm 1i engaging and moving downwardly a second arm 61' againstthe bias of springs 75v and 16 to operate the switch 52 to effect a change in the circuit connections corresponding to the movement of the switch 52 from its left to its right hand position as.

viewed in Fig. 2.

While the disk. predetermines the frequencyof' recalibration, an additional cam 11 secured to shaft 68 has a recess 11a whose size predeter- ,mines the number of cycles of operation of the relay for recalibration. Eight cycles for recalibration is ordinarily sufficient.

, naled on shaft 68.

The slidewire 5i and clutch disk 62 are pivotally carried from a depending end of an arm 18 jour- Therefore, upon occurrence of the aforesaid clockwise movement of the arm H, the arm 18 by reason of the resilient connection formed by the spring 15, is rotated in a clockwise direction to effect. driving engagement between the clutch disk ,62 .and the cooperating disk 53 driven by the .shaft 36-. 'i

If the voltage of thebattery 53, Fig. 2, has deviated from its predetermined value the pointer 29, after release by the bars 28, deflects a prede termined amount to shift the clutch arm 33 in a corresponding direction and by a'corrcsponding or amplified amount. One or the other of restoring earns 31 thereafter returns the clutch arm 33 to its normal or horizontal position, the arm 33 because of its aforesaid engagement with the clutch disk 34 rotating the latter and its shaft 36 in a corresponding direction and by a correrecalibration. As soon as these; cycles, for example, eight of them, have been completed the cam 11 lifts the arm 1!, the springs 15 and 15 then returning the arms 6! and 13 to the positions shown in Fig. 3.

Since, during recalibration, the extent of movement of the calibrating slidewire 54 is generally very small, it is desirable to prevent the driving engagement betwecndisks Bi and 83 while the clutch arm 33 is in'a deflected position. To this end an additional arm mounted on subsidiary-frame 60 (Fig. 1F), one slotted end 80a (Fig. 3) of which engages a pin mi carried by the arm 18 80b of which is arranged to cooperate with a pointed projection 8la of a cam .8! secured to the shaft 68, the position of the-pointed end Sic the correct voltage from plete '80 may be pivotally' and the opposite end I arm I], is, through link unit mechanism is preferably of the type the switch 52. As soon as the clutch arm 3313 returned to its neutral position by one or the other of the restoringcams 31, the cam II will have been-rotated an amount .sufllclent to release the arm n toeil'ct the aforesaid driving.

engagement between disks. and 88;

-In the foregoing strtpachart curve drawing vice 82a arranged to'unbalance the measuring network in response to change in frequency of a I source of current and thereby cause deflection of the galvanometer pointer.

If desired, additional control devices may be supported on the panel, such, for example, as a switch 82b and a rheostat 820.

The interchangeability of the several mechanisms illustrated on Sheet 1 of the drawings to change the character of the instrument constitutes an important feature of the present in vention. For example, when it is desired to con-- vert the curve-drawing instrument into one for indicating, recording or measuring two distinct conditions at the same or different locations, the complemental. or subsidiary frame I4 is replaced by a frame 83, Fig. 113; having depending projections 83a and 83b identical with the depending projections IZa'and l3b both as to shape and function. In this instance the pen or marker l 5 is not only slidable upon a rod or an elongated element shown as shaft 84 but its carriage lid is also keyed or otherwise secured to it for rotation therewith. Upon clockwise movement of an arm 85, as viewed in Fig. 1B, the shaft 84 lifts the peril 5 from the record chart. Preferably the pen or marker-assembly is of the type shown and described in aforesaid copending application Serial No. 3,195. Briefly, it consists of the carriage l5a pivoted by pins |5b to a bracket l5c slidably mounted on splined shaft 84. :The marker itself, including its container, is resiliently held. in a clip 15d. An extensiohiiemay be provided; an

upturned end of which vforms a pointer for" a scale 15g calibrated in'jsimilar manner to the chart C. In lieu of the pins 45, FigslA and 13, a clamp lilh isarranged to maintain a driving connection between the marker assembly'and the driving cord or belt ll. 1

In order to oscillate the marker "into and out of engagement withthe chart C there is provided the unit operating mechanism of Fig. lb which comprises a frame 86 secured to chassis in by screws passing through'openings 86a. On the frame 36 there is pivotally supported at Ma an operating arm 81. Supported in one end of arm 81, Fig. 4, is an adjustable pin 83 registering with the outer periphery of a disk 89 driven by a worm gear 90 and a worm 30a secured to the drive shaft. The disk I! is provided with two recesses 39a and 89b diametrically opposite each other; the recess 88b is. substantially deeper than recess-"0' and as shown may be aperlpheral notch. A biasing spring 9|, connected' to the as, itself secured to shaft 84, effective to bias for movement toward the record chart the shaft 84 and with it the marker l5. An adjustable stop 93 may be provided to limit the throw of the arm 81 under influence of the biasingspring 9|. This 92 and the crank arm' ana'ns I scribed in the aforesaid copending application,

Serial No. 3,195.

Preferably the ratio of gears 90 and 90a is such that one or the other of recesses 89a and 09b registers with the pin 88, upon completion of a predetermined number of revolutions, such as twenty-four, of the shaft 30; each revolutionof the shaft corresponding to one operating cycle of the mechanical relay.

With the subsidiary frames 03 and 05, Figs. 13 and 1b, secured to the main chassis I as described above, it will be assumed the mechanical relay has completed its predetermined number of cycles, such as twenty-four. The marker I occupies a position with respect to the chart C corresponding to the magnitude of the condition. Asthe twenty-fourth cycle is completed the pin 08 registers with notch 89a. As soon as notch 94a of cam 94 driven by shaft 30 registers with pin 95 carried by arm 81, the marker I5 is quickly lowered into engagement wi h the chart. By means of the set screw 94b the cam 94 may be adjusted so that the aforesaid registration takes place while the clutch arm 33 is horizontal. The extent of movement of the marker is limited by the depth of recess 89a and, in this instance, is Just sufficient for the pen to engage the chart to leave imprinted thereon a dot. Since the marking of the dot occurs while the clutch arm a is horizontal, smearing and are eliminated. rotation of cam 94, the record chart.

The selector switch 510. (Figs. 4 and 4A) is then moved, as by cam 51b driven by shaft 90b, to a second position to connect the galvanometer G in circuit with a second condition responsive device, as for example the device 56a of Fig. 2. After the relay has again completed its twenty- The marker I5, by continued is immediately lifted from 40 four cycles of operation and has moved the marker The additional and on the upper I5 to correspond with the magnitude of the second condition under measurement or control, the notch 89b is then moved into registration with the pin 80. In this case the marker I5, after registration of notch 94a and pin 95, is not only moved into engagement with the chart, but by reason of the greater depth of the notch or recess 90!), the marker I5 after engagement of the chart slides along the chart and marks thereon a dash. movement which results in the dash is provided for by the pivotal interconnection of the carriage I5a and the bracket I50. As the aforesaid cycles are repeated, the two distinctive records periodically register on the chart the respective magnitudes of the conditions under measurement or control.

As previously explained, in accordance with the present invention the main chassis I0 is utilized for a wide variety of types of instruments and it will be seen that the character of the recording instrument or mechanism may be widely varied by'slmply using selected devices, of which, in accordance with the present invention, a wide variety are available. For example, the calibrating device (Fig. 1F) is preferably included 'for potentiometer operated recorders while for other types it may or may not be omi ted. Each instrument, in accordance with the present invention, is characterized by the'provisions for mounting the marker-assemblies of Figs. 1A, 113 surface of the chassis I0, with their respective opera ive relation with a markable element supported from an adjacent side of the main chassis.

Further in accordance with the invention, the unit irregular records markers supported in cooperating mechanisms are supported on the ends of the chassis I0 with the shaft 30 interconnecting them and each having component parts arranged for cooperation with other parts of component assemblies of the instrument. The arrangement, method and structural features of the present invention decrease the cost of the recorder and provide great flexibility in the possible use which may be made of the instrument.

In case the instrument is to be used to measure or control a large number of conditions, a multiple point printing assembly (Fig. 1C) comprising a mainframe 98 having depending projection 90a and 90b, may be secured to the main chassis I0 in the manner described in connection with Figs. 1A and 1B. Journaled in the frame 98 are a pair of guide shafts 99, I00. The print wheel IOI, having distinctive characters IOIa'(Figs. 3 and 5) spaced about its periphery, is journaled in a frame I03 pivotally secured to a carriage I04 within which is journaled an inking disk I05, the inking disk and print wheel having secured to their respective stub shafts, gears I05 and I01 (Figs. 3 and 4) arranged in meshing engagement with a gear I09 journaled in the carriage I04 and keyed to the shaft99. From the carriage I04 extend arms H0 which engage opposite sides of the shaft I00 to prevent rotation of the carriage; the frame I03 is provided with an extension III, one end of which nest-s within a longitudinal slot I00a provided in the shaft I00.

In order to operate the aforesaid printing mechanism, a unit operating mechanism, Fig. 1c, having a subsidiary frame I I5 is secured to the main chassis Ill. The details of the mechanism carried by the frame II5 are clearly shown in the lower left hand portion of Fig. 3 as well as the phase relation of cam I I6, disk I I1, and the manner in which operating arms 8 and H9 are fastened together after both the subsidiary frame H5 and the multiple point printing assembly of Fig. 10 have been secured to the main chassis I0.

with the recorder mechanism, or instrument, as thus constructed, and with the selector switch 51 supported from the frame 98 and driven by a third shaft 51a geared to shafts 99 through idler gear 99a, the mechanical relay, positions or drives by means of the endless belt 4|, the carriage I04, carrying the frame I03, with respect to the chart. After a predetermined number of revolutions of shaft 30, for example twenty-four, the disk H1 is moved until its notch II1a registers with a projection I20 of arm H8. The arm H8, moving under the influence ofa biasing spring I22 as soon as the recess II5a of cam IIG registers with a projection I23, rotates by means of the link H9 a crank arm I24 and the shaft I00 in a clockwise direction. By means of the extension I I I the frame I03 is rotated about its pivotal axis until the print wheel IOI prints a distinctive character upon the chart. This printing movement is relatively rapid, the print wheel being immediately returned by rotation of the cam I I6 driven by shaft 30. The return movement of the print wheel and the crank arm I24 causes the ratchet pawl I28 to rotate the shaft 99 and the gears I09 and I01-an amount-sufficient to move the print wheel IM to bring another of its reference characters. into printing position. At the same time thegear I06 drives the inking disk I05 an amount sufficient to bring the next inking pad into registration with the next character.

By means of a raised portion (Fig. 3A) preferably adjacent the notch IIla of the disk I", a slight counterclockwise movement, just prior to each printing operation, is imparted to the print wheel I! to. move it firmly into encasement with a corresponding one or the inking pads Illa car.-

ried by'theinkingdi'sk I Ill, thereby inking another above, the projection I23, prior to the time one oi" the prlntinircharacters ior subuque'ntw printing operation;

During the-aforesaid rotation-oi the elongated element or sharg-ssg-r mer sumr switch- J1 is." moved toanewposition' toconnect a succecding one, Fig. 2, ofthe'various condition responsive ":i elements 56, 380, etc. into the potentiometer network or circuit. While the recalibrating unit, Fig.- II', maybe. omitted from the last described recording mech'a nism, it is desirable to include' such a unit. As described in the aforesaid copending application Serial No. 75,208, the recalibrating periodis preferably independent of the position 01' the selector switch 51. To prevent printing operations during recalibration, a projection I28 supported from worm wheel I29 is arranged for movement beneath a projection H80. of arm H8.

The position of the with respect to the disk 64 of the recalibrating unit so: that the projection I28 moves beneath the projection 8:: of the arm II8 after the pro-.

ection of arm' H of disk 64 registers with its associated projection.

Proper phasing is' readily obtained. For exregisters with the recess 64a set screw 60f has been locked. in position, the

mechanical relay is operated until-the notch 84a of the disk 64 registerswith it's cooperating. pro- 'jection of arm. 1I, cam 11 -registers words, the calibrating mechanism is first operated to initiate recalibration. The motor M is then deenergi'zed.

In case the notch 11a and 64a do not simultaneously register with their respective projections, the disk .64 is loosened unscrewing the screws 64b and adjusted until the arm 1I frely moves The screws 64b are tightened and adjustment then made of the unit operating mechanism of and until the recess 11a of Sincethe cam 'II6, Fig. 3, is secured directly;

to the shaft, it is loosely carried in a compart- H6. to the shaft with its depression II 611 registering with the pin or follower I23 while the clutch arm 33 is in a horizontal position.

adjusted until notch I Ila and I I6a simultaneously register with their respective projections I20 and I23, by loosening a set screw (not shown) which secures the disk to its shaft, or adjusting means identical with that of disk 64 may be provided. The parts are now in position for printing-a record-on the chart and for initiation of recali To prevent printing and movement of the-selector switch 51 the arm II8.

brating operations.

.3129... The proper phase relation is thereafter projection I28 -is phased ness.

and before the recess 11a of cam 11" carried with its projection. In otherfrom its driving hub by to its lower position."

If necessary the disk I I1 may be t the projection I28 rotated I28a are 7 then tightened to lock the projection to thegeer 29a is shown in drawing instrument Figsri, 1A and 11''.

After-calibration has been completed, as defor printing ismoved to again free the arm IIB thccamlll.

icrmovemsntin accordance with the positions "lmiim'msi lllmd with-the present invention an nstrument".oi' the round-chart type is readily providdbysubstltutingthe unit assembly of-Flg. 1E

. for thassembiy oI-Ii'lg. 1D. The former comprises a frame- I'Sfl provided with hinge elements III "and"! arranged After the frame- I 30 is lowered into place, it is swung in a clockwise direction, as viewed from the top of the instrument, until a projection. I35, Fig. 1E, secured to a pulley I31 nests within a notch I38a of a disk I33 rigidly secured to the relay shaft 36. (In Fig; 1E the pulley I31 is shown below the gearing I34 for the sake of clear- In practice it is preferably journaled on a stub shaft carried by the lower gear of gearing I34.) This driving connection takes the place of the endless belt or cord 4I. Thus, in response to variation In the magnitude of the condition; the

., m'oyensent the shaft 38 is transmitted to the ample, after the unit mechanism (Fig. 1F) by pulley 'I31'upon which is' supported an endless s p orted on additional idler pulleys (not shown) .by an'ann I40, Fig. 6D, pivoted at I, theoutermost portion radially oi the chart by the cord or belt I33. The

combination'ofv the index and marker, per se,

iorms no part of the present invention; it is fully described in copending applications Serial Nos. 692,803 and 740,260 respectively flied on'October 9. 1933 and on August 17, 1934, both assigned to the same assignee as the present invention.

In accordance with a further feature of the present invention, any one of the various exhibiting instruments which may be formed by complemental assembly or subsidiary units on the main chassis I0 is arranged for mounting in a housing or casing. The over-all dimensions of each of the various exhibiting instruments is approximately the /same so that ahousing of a single size is suitable for all of instruments I Referring nowlto Figs. 6 and 6A, a housing I45 is provided with hinge elements I48 and I41 arranged to receive the main frame or chassis I0. Before supporting the main chassis Il from the housing I43, however, the gears 23a and 26b are removed from their respective shafts, suitable set screws being provided for this purpose. The set screw m of the gear Fig. 6E. The main chassis I0 may now be lowered into place, the lower portions of the hinge pins 24 and 25 being freely slidable through the openings in the hinge elements I46 and I41. The gears 26a and 26b are then replaced on their respective shafts 24b and 26 and the set screws tightened.

Either the strip chart assembly of Fig. 6C or comprising mechanisms of of the belt I33 being threaded over a pulley supported from the arm 01' the various types hinge pins" and 25 of the subsidiary operating mechanisms and panels.

When the desired type of instrument has been assembled as above. described, the instrument as a whole is swung inwardly into the housing I45. For the strip chart assembly a door I50 with a rectangular glass window II is by hinge p ns I52 secured to the housing I45. For the round chart instrument a door I54 with a round glass window I55 is used.

The housing itself may be supported from a panel, framework, or supporting structure in the usual conventional manner. In case the front of the housing is arranged with respect to other apparatus, or its supporting structure, in a manner such that the main chassis I0 and its associated complemental units or assemblies may not be readily swung out of the housing, the doublehinge arrangement and housing I56 of Fig. 63 may be used, which provides for the pivotal movement of the recorder mechanism either through a front or rear opening thereof. In addition to provisions for the front door, which may be either of the type shown in Figs. 6c and 6d, additional provisions on the housing I56 are made for a rear door I51 hinged for movement between open and closed positions. 1

The double-hinge arrangement comprises an auxiliary hinge plate I60 having hinge elements ,IIiI and I62 elements I63 and I64 formed integrally with the which rest respectively upon hinge housing I56, suitable hinge pins being provided to maintain the elements in alignment. An additional pair of hinge elements I66 and I61, located at the opposite end of the plate I60, is arranged to receive the hinge pins 24 and 25 of the main chassis I0, these elements I66 and I61 having the identical function as the hinge elements I46 and I41 of the .casing I45of Fig. 6A.

As shown in Fig. 6B the rear door I51 is in the open position and the front door omitted. In consequence, a pair of leaf springs I10 is effective to move rods Ill and I12 respectively toward the front and rear of the housing I56. A latch I13 secured to the rod 'I1I is thereby retained behind a cooperating latch I14 carried by the housing I56. Similarly, a latching member I15 carried by the rod I12 and projecting through an opening provided in the plate I60 is moved behind a cooperating latching member I16 carried by the main chassis I0. Therefore, with both front and rear doors in the open position the main chassis I0 is locked in position and no pivotal movement can occur.

If the rear door I51 is closed it engages the end of the rod I12 and moves it against the bias of the springs I10 to disengage the latching member I15 from its cooperating member I16. The chassis I0 may now be swung outwardly through the front of the housing for inspection of parts or for change'in the character of the unit assemblies, or for replacement of parts.

Assuming now that the main chassis I0 is within the housing I56 and that the front door is moved to the closed position, it will be seen that the rod I1I is moved against the bias of the springs I10 to disengage latch members I13 and I14. The chassis I0 may now be swung about its right-hand pivotal axis, the plate I60 moving with the chassis. In this manner pivotal movement of the chassis is selectively controlled by the In the same way a selected one a front and rear doors and unless the rods "I and I12 are manually operated either the front or the rear door must be closed before the main chassis I0 can be swung from the housing.

While there has been described what at present are considered the preferred embodiments of the invention, it will be obvious to those skilled in the art that-various changes and modifications may be made without departing from the invention and therefore the appended claims cover all such changes and modifications as fall within the spirit and scope of the invention.

What is claimed is:

1. An exhibiting instrument comprising a main chassis upon which there are supported a motor, a primary condition responsive device, a mechanical relay controlled by said primary device for actuating a driving member, and an operating shaft driven by said motor for operating said relay andextending across one side of said chassis,

provisions on one end of said chassis for supporting a recalibrating unit with a driving element thereof driven by said shaft, provisions for sup porting on the opposite end of said chassis a marker-actuating means with a driving element thereof driven by said shaft, and provisions on said main chassis for supporting exhibiting structure including at least one movable member, said shaft mechanically interconnecting said markeractuating means and said recalibrating unit.

2. In a recorder, a plurality of complemental unit assemblies, a main chassis upon which are permanently mounted respectively a driving motor, a primary condition responsive device, a mechanical relay device, a secondary member movable by said motor under the control of said primary device and said relay device, and a marker-driving means connected to said secondary member, one of said unit assemblies comprising a marker and supporting frame, means mounting said marker on said frame for independent traverse and rotational movement, provisions on said chassis and said frame for supporting said marker in operative relation to said marker-driving means for transverse movement, a second unit assembly comprising chart-supporting mandrels and a second frame therefor, a driven member for rotating at least one of said mandrels, provisions on saidv chassis and said second frame for mounting said second frame on said chassis, a driving member journaled in said a third unit assembly comprising an actuating member, driving means for imparting predetermined movement to said actuating member, provisions on said chassis for supporting said third unit assembly therefrom, means connecting said driving means in predetermined phase relation to said relay device, and means operable by said actuating member to move said marker into and out of engagement with the chart.

3. In a recorder, the combination of a plurality of complemental unit assemblies, one assembly comprising a chassisupon which are mounted a rotatable element and means operable in accord with changes in the magnitude of a condition for effecting rotation of said element, a second of said unit assemblies comprising a frame upon which are mounted a marker and an elongated element slidably supporting said marker, at third of said unit assembliescomprising a second frame upon which are mounted rotatable means for supporting a markabie element and driving means therefor, provisions on said complemental unit assemblies for positioning said first and second-named frame is in said operative relation for displacing said marker acrosssaid markable element, and means operable when said second-named frame is in said operative relation for driving said rotatable means and said markable element at a predetermined speed with respect to said marker.

4. In a recorder, the combination of a plurality of complemental unit assemblies, one assembly comprising a chassis upon which are mounted a rotatable element and means operable in accord with changes in the magnitude of a condition for effecting rotation of said element, a second of said unit assemblies comprising a frame upon which are mounted a marker and an elongated element slidably supporting said marker, a third of said unit assemblies comprising a second frame upon which are mounted rotatable means for supporting a markable element and driving means therefor, provisions on said complemental unit assemblies for positioning said first and second-named frames with said marker disposed continuously to produce a mark upon said markable element, means operable by said rotatable element when said first-named frame is in said operative relation for displacing said marker across said markable element, and means operable when said second-named frame is in said operative relation for driving said rotatable means and said markable element at a predeter-' mined speed with respect to said marker.

5. In a recorder, the combination of a plurality of complemental unit assemblies, one assembly comprising a chassis upon which are mounted a rotatable element and means operable in accord with changes in the magnitude of a condition for effecting rotation ofsaid element, a second of said unit assemblies comprising a frame upon which are mounted a marker and an elongated element determining the path of -movement of said marker, a third of said unit assemblies comprising a second frame-upon which are mounted rotatable means for supporting a markable element and driving means therefor, provisions on said complemental unit assemblies for positioning said first and second-named frames with said marker disposed in operative relation to said markable element, means operable by said rotatable element when said first-named frame is in said operative relation for displacing said marker across said markable element, means operable when said second-named frame is in said cooperative relation for driving said rotatable means and said markable element at a predetermined speed with respect to said marker, a fourth of said complemental unit assemblies comprising a third frame upon which are mounted calibrating means, provisions on said third frame and one of said other complemental unit assemblies for positioning said third frame in operative relation to said rotatable element, and means intermittently operable for effecting a driving connection between said rotatable element and said calibrating means.

6. In a recorder, the combination of a plurality of complemental unit assemblies, one assembly comprising a chassis upon which are mounted a rotatable element and means operable in accord with changes in the magnitude of a condition for effecting rotation of said element, a second of said unit assemblies comprising a first frame upon which are mounted a marker and means including an elongated element slidably supporting said marker and providing for pivotal movement of said marker, a third of, said unit assemblies comprising a second frame upon which are mounted rotatable means for supporting a markableelement and driving means therefor, provisions on'said complemental unit assemblies for supporting said first and second frames with said marker disposed in operative relation with said markable element, means driven by said rotatable element for displacing said marker across said markable element when said first frame is in its supported position, means operable when said second frame is in its supported position for driving said rotatable means at predetermined speed With respect to said marker, a fourth of said unit assemblies comprising a third frame upon which are mounted a marker-actuating member and control means for predetermining the movement of said actuating member, provisions on said complemental unit assemblies for supporting said last-named unit assembly with said actuating member operatively associated with said marker assembly to control'said pivotal movement to move said marker into and out of operative position with respect to said markable element, and means carried by said chassis for actuating said control means at a speed bearing a predetermined relation to said speed of said markable element. l

7. In a recorder, the combination of a plurality of complemental unit assemblies, a main chassis upon which are mounted a continuously rotating under the control of said primary device-and said relay, one of said unit assemblies comprising a frame upon which are mounted an elongated supporting member, a print wheel slidably supported by said member and-bodily movable into and out of a printing position, and means controlling the printing movement of said print wheel, a second of said unit assemblies comprising a frame upon which are mounted-rotatable elements for supporting a chart and driving means for said chart, a third of said unit assemblies comprising a frame upon which are mounted an actuating member for effecting at predetermined times a printing operation of said print wheel and operating means for said member, provisions on said main chassis for supporting said first and secondnamed frames in relation such that said print wheel is disposed for printing engagement with said chart, means operable by said secondary member when said first-named frame is in its supported position for displacing said print wheel across said chart, means operable when said second-named frame is in its supported position for connecting said chart-driving means to said continuously rotating shaft, provisions on said chassis for supporting said third-named frame with its said actuating member in cooperative relation with said print-wheel control means, means for der the control of said galvanometer, a plurality auans oi complemental unit assemblies each having its own supporting frame and respectively compris ing chart-supporting and actuating means, recalibrating means, and control means for the marker, provisions on said main chassis for supporting said recalibrating and marker-control assemblies at said opposite ends of said chassis. means for connecting said first-named shaft to said last-named assemblies to establish a ilxed phase relation between them and said relay. pr visions on said main chassis for supporting said chart assembly adjacent said side portion of said main chassis with its chart-actuating means in driving engagement with said other shaft, provisions on said main chassis for supporting said marker assembly from another side portion of said chassis with its marker in cooperative relation with said chart, and means eflective when said marker assembly is in said supported position for establishing a driving connection between said marker and said secondary member for displacement of said marker across said chart. RAYMOND W. ROSS.

- SOPHIE SEBERHAGEN. lucutrix of the Last Will and Testament of Sinard H. Seberhaaen, Deceased. 

